There is provided a window opening and closing device (30) for opening and closing a window, the window comprising a window handle (34) having a button (36) being pressable to permit actuation of the window handle (34) to open or close the window, wherein the window opening and closing device (38) comprises a hand-operable member (40) and a handle actuator lever (38), the handle actuator lever (38) pivotally connected to the hand-operable member (40), the handle actuator lever (38) including: a handle holder (48) for holding the window handle (34); and a push element (50) for pressing the button (36).